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LF: driver chips and keying.

To: "LF Group" <[email protected]>
Subject: LF: driver chips and keying.
From: "G3YXM" <[email protected]>
Date: Wed, 13 Jun 2001 22:44:33 +0100
Reply-to: [email protected]
Sender: <[email protected]>
Dear all.

Beware of keying any but the TC4426 chip... The non-inverting TC4427 has its
two outputs overlapping as the volts drop below 12, whereas the 4426
develops a dead band between the two outputs when the Volts are low. This
aids soft(ish) keying.
What a combined inverting / non-inverting chip would do would probably be a
combination of both!

High-level keying of the supply with another big mosfet is my preffered
system these days, you can tailor the envelope any way you like.

73. Dave G3YXM.

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